6
FUNCTIONS
6.24 Serial Communication Function
6
- 183
1
O
verv
iew
2
Per
fo
rma
nce
S
p
ecifica
tio
n
3
S
equ
en
ce P
ro
g
ra
m
Co
nfig
ura
tio
n a
nd
E
xecut
io
n Co
nd
iti
o
ns
4
I/O N
unb
er
Assig
n
m
e
nt
5
Me
mor
ie
s a
nd
File
s
Ha
nd
led
by CP
U Mo
du
le
6
Func
tions
7
Co
mmu
nic
a
tion
us
in
g
bu
ilt
-i
n E
th
e
rne
t po
rt
s o
f
CP
U mod
u
le
8
Co
mm
un
icatio
n
w
ith
Int
e
lli
ge
nt
Fun
ction
Mo
du
le
(4) Accessible devices
: Read/write enabled, : Write disabled
* 1 : After changing the number of CPU module device points on GX Developer, use the devices in the
new device No. range.
Decimal and hexadecimal indicate that the device specified for the MC protocol command is
decimal or hexadecimal.
* 2 : Hexadecimal when specified for the command of the MC protocol.
Table6.55 Devices that can be accessed by serial communication function
Class
Device
Device Code
Device Number Range
*1
(Default Value)
Write
Read
Internal
system device
Function input
FX
*2
000000 to 00000F
Hexadecimal
Function output
FY
*2
000000 to 00000F
Hexadecimal
Function register
FD
000000 to 000004
Decimal
Special relay
SM
000000 to 001023
Decimal
Special register
SD
000000 to 001023
Decimal
Internal user
device
Input
X
000000 to 0007FF
Hexadecimal
Output
Y
000000 to 0007FF
Hexadecimal
Internal relay
M
000000 to 008191
Decimal
Latch relay
L
000000 to 002047
Decimal
Annunciator
F
000000 to 001023
Decimal
Edge relay
V
000000 to 001023
Decimal
Link relay
B
000000 to 0007FF
Hexadecimal
Data register
D
000000 to 011135
Decimal
Link register
W
000000 to 0007FF
Hexadecimal
Timer
Contact
TS
000000 to 000511
Decimal
Coil
TC
Current value
TN
Retentive
timer
Contact
SS
------
Decimal
Coil
SC
Current value
SN
Counter
Contact
CS
000000 to 000511
Decimal
Coil
CC
Current value
CN
Link special relay
SB
000000 to 0003FF
Hexadecimal
Link special register
SW
000000 to 0003FF
Hexadecimal
Step relay
S
000000 to 002047
Decimal
Direct input
DX
000000 to 0007FF
Hexadecimal
Direct output
DY
000000 to 0007FF
Hexadecimal
Index register
Z
000000 to 000009
Decimal
File register
R
000000 to 032767
Decimal
ZR
000000 to 00FFFF
Hexadecimal
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